Java : Integer with Examples

Integer (Java SE 18 & JDK 18) API Examples.
You will find code examples on most Integer methods.

Summary

The Integer class wraps a value of the primitive type int in an object. An object of type Integer contains a single field whose type is int.

Class diagram

// Compile error.
final var list = new ArrayList<int>();

// OK.
final var list = new ArrayList<Integer>();
list.add(1);
list.add(2);
list.add(3);

System.out.println(list); // [1, 2, 3]

Fields

static final int BYTES

The number of bytes used to represent an int value in two's complement binary form.

System.out.println(Integer.BYTES); // 4

static final int MAX_VALUE

A constant holding the maximum value an int can have, 2³¹-1.

System.out.println(Integer.MAX_VALUE); // 2147483647
System.out.println("0x" + Integer.toHexString(Integer.MAX_VALUE)); // "0x7fffffff"

static final int MIN_VALUE

A constant holding the minimum value an int can have, -2³¹.

System.out.println(Integer.MIN_VALUE); // -2147483648
System.out.println("0x" + Integer.toHexString(Integer.MIN_VALUE)); // "0x80000000"

static final int SIZE

The number of bits used to represent an int value in two's complement binary form.

System.out.println(Integer.SIZE); // 32

static final Class<Integer> TYPE

The Class instance representing the primitive type int.

System.out.println(Integer.TYPE.getSimpleName()); // "int"
System.out.println(Integer.TYPE.isPrimitive()); // true

Constructors

Integer (int value)

Deprecated, for removal: This API element is subject to removal in a future version. It is rarely appropriate to use this constructor.

Deprecated.

Integer (String s)

Deprecated, for removal: This API element is subject to removal in a future version. It is rarely appropriate to use this constructor.

Deprecated.

Methods

static int bitCount (int i)

Returns the number of one-bits in the two's complement binary representation of the specified int value.

int value = 0;
System.out.println(Integer.toBinaryString(value)); // "0"
System.out.println(Integer.bitCount(value)); // 0

int value = 1;
System.out.println(Integer.toBinaryString(value)); // "1"
System.out.println(Integer.bitCount(value)); // 1

int value = 2;
System.out.println(Integer.toBinaryString(value)); // "10"
System.out.println(Integer.bitCount(value)); // 1

int value = 3;
System.out.println(Integer.toBinaryString(value)); // "11"
System.out.println(Integer.bitCount(value)); // 2

int value = 4;
System.out.println(Integer.toBinaryString(value)); // "100"
System.out.println(Integer.bitCount(value)); // 1

int value = 5;
System.out.println(Integer.toBinaryString(value)); // "101"
System.out.println(Integer.bitCount(value)); // 2

int value = 6;
System.out.println(Integer.toBinaryString(value)); // "110"
System.out.println(Integer.bitCount(value)); // 2

int value = 7;
System.out.println(Integer.toBinaryString(value)); // "111"
System.out.println(Integer.bitCount(value)); // 3

int value = Integer.MAX_VALUE;
System.out.println(Integer.toBinaryString(value)); // "1111111111111111111111111111111"
System.out.println(Integer.bitCount(value)); // 31

int value = Integer.MIN_VALUE;
System.out.println(Integer.toBinaryString(value)); // "10000000000000000000000000000000"
System.out.println(Integer.bitCount(value)); // 1

byte byteValue ()

Returns the value of this Integer as a byte after a narrowing primitive conversion.

final var ret1 = Integer.valueOf(0).byteValue();
System.out.println(ret1); // 0

final var ret2 = Integer.valueOf(123).byteValue();
System.out.println(ret2); // 123

final var ret3 = Integer.valueOf(-45).byteValue();
System.out.println(ret3); // -45

final var ret1 = Integer.valueOf(Byte.MAX_VALUE).byteValue();
System.out.println(ret1); // 127

final var ret2 = Integer.valueOf(Byte.MIN_VALUE).byteValue();
System.out.println(ret2); // -128

final var ret1 = Integer.valueOf(127).byteValue();
System.out.println(ret1); // 127

final var ret3 = Integer.valueOf(128).byteValue();
System.out.println(ret3); // -128

final var ret4 = Integer.valueOf(129).byteValue();
System.out.println(ret4); // -127

final var ret1 = Integer.valueOf(-128).byteValue();
System.out.println(ret1); // -128

final var ret3 = Integer.valueOf(-129).byteValue();
System.out.println(ret3); // 127

final var ret4 = Integer.valueOf(-130).byteValue();
System.out.println(ret4); // 126

static int compare (int x, int y)

Compares two int values numerically.

System.out.println(Integer.compare(0, 0)); // 0
System.out.println(Integer.compare(0, 1)); // -1
System.out.println(Integer.compare(1, 0)); // 1
System.out.println(Integer.compare(1, -2)); // 1
System.out.println(Integer.compare(-4, -2)); // -1
System.out.println(Integer.compare(1000, -1000)); // 1

int compareTo (Integer anotherInteger)

Compares two Integer objects numerically.

final var value1 = Integer.valueOf(0);
final var value2 = Integer.valueOf(0);
System.out.println(value1.compareTo(value2)); // 0

final var value1 = Integer.valueOf(0);
final var value2 = Integer.valueOf(1);
System.out.println(value1.compareTo(value2)); // -1

final var value1 = Integer.valueOf(1);
final var value2 = Integer.valueOf(0);
System.out.println(value1.compareTo(value2)); // 1

final var value1 = Integer.valueOf(1);
final var value2 = Integer.valueOf(-2);
System.out.println(value1.compareTo(value2)); // 1

final var value1 = Integer.valueOf(-4);
final var value2 = Integer.valueOf(-2);
System.out.println(value1.compareTo(value2)); // -1

final var value1 = Integer.valueOf(Integer.MAX_VALUE);
final var value2 = Integer.valueOf(Integer.MIN_VALUE);
System.out.println(value1.compareTo(value2)); // 1

static int compareUnsigned (int x, int y)

Compares two int values numerically treating the values as unsigned.

final int value1 = 0;
final int value2 = 0;
System.out.println("0x" + Integer.toHexString(value1)); // "0x0"
System.out.println("0x" + Integer.toHexString(value2)); // "0x0"
System.out.println(Integer.compareUnsigned(value1, value2)); // 0

final int value1 = -1;
final int value2 = 1;
System.out.println("0x" + Integer.toHexString(value1)); // "0xffffffff"
System.out.println("0x" + Integer.toHexString(value2)); // "0x1"
System.out.println(Integer.compareUnsigned(value1, value2)); // 1

final int value1 = -1;
final int value2 = -2;
System.out.println("0x" + Integer.toHexString(value1)); // "0xffffffff"
System.out.println("0x" + Integer.toHexString(value2)); // "0xfffffffe"
System.out.println(Integer.compareUnsigned(value1, value2)); // 1

final int value1 = 5;
final int value2 = 10;
System.out.println("0x" + Integer.toHexString(value1)); // "0x5"
System.out.println("0x" + Integer.toHexString(value2)); // "0xa"
System.out.println(Integer.compareUnsigned(value1, value2)); // -1

final int value1 = Integer.MAX_VALUE;
final int value2 = Integer.MIN_VALUE;
System.out.println("0x" + Integer.toHexString(value1)); // "0x7fffffff"
System.out.println("0x" + Integer.toHexString(value2)); // "0x80000000"
System.out.println(Integer.compareUnsigned(value1, value2)); // -1

static Integer decode (String nm)

Decodes a String into an Integer.

System.out.println(Integer.decode("0")); // 0
System.out.println(Integer.decode("123")); // 123
System.out.println(Integer.decode("+456")); // 456
System.out.println(Integer.decode("-789")); // -789

//Integer.decode("xyz"); // NumberFormatException

// Hexadecimal
final var ret1 = Integer.decode("0xff");
System.out.println(ret1); // 255
System.out.println(Integer.toHexString(ret1)); // "ff"

final var ret2 = Integer.decode("-0xff");
System.out.println(ret2); // -255
System.out.println(Integer.toHexString(ret2)); // "ffffff01"

final var ret3 = Integer.decode("#abcd");
System.out.println(ret3); // 43981
System.out.println(Integer.toHexString(ret3)); // "abcd"

final var ret4 = Integer.decode("0X7fffffff");
System.out.println(ret4); // 2147483647
System.out.println(Integer.toHexString(ret4)); // "7fffffff"

// Octal
final var ret1 = Integer.decode("01234");
System.out.println(ret1); // 668
System.out.println(Integer.toOctalString(ret1)); // "1234"

final var ret2 = Integer.decode("-01234");
System.out.println(ret2); // -668
System.out.println(Integer.toOctalString(ret2)); // "37777776544"

Optional<Integer> describeConstable ()

Returns an Optional containing the nominal descriptor for this instance, which is the instance itself.

final var ret = Integer.valueOf(123).describeConstable();
System.out.println(ret); // Optional[123]

static int divideUnsigned (int dividend, int divisor)

Returns the unsigned quotient of dividing the first argument by the second where each argument and the result is interpreted as an unsigned value.

final var value = -1294967296;
System.out.println(value / 2); // -647483648

System.out.println(Integer.toUnsignedString(value)); // 3000000000
System.out.println(Integer.divideUnsigned(value, 2)); // 1500000000

double doubleValue ()

Returns the value of this Integer as a double after a widening primitive conversion.

final var value = Integer.valueOf(1234).doubleValue();
System.out.println(value); // 1234.0

final var value = Integer.valueOf(-4567).doubleValue();
System.out.println(value); // -4567.0

final var value = Integer.valueOf(Integer.MAX_VALUE).doubleValue();
System.out.println(value); // 2.147483647E9

final var value = Integer.valueOf(Integer.MIN_VALUE).doubleValue();
System.out.println(value); // -2.147483648E9

boolean equals (Object obj)

Compares this object to the specified object.

final var value1 = Integer.valueOf(100);
final var value2 = Integer.valueOf(100);
final var value3 = Integer.valueOf(999);

System.out.println(value1.equals(100)); // true
System.out.println(value1.equals(value2)); // true
System.out.println(value1.equals(value3)); // false

final var value1 = Integer.valueOf(100);
final var value2 = Long.valueOf(100);

System.out.println(value1.equals(value2)); // false

float floatValue ()

Returns the value of this Integer as a float after a widening primitive conversion.

final var value = Integer.valueOf(1234).floatValue();
System.out.println(value); // 1234.0

final var value = Integer.valueOf(-4567).floatValue();
System.out.println(value); // -4567.0

final var value = Integer.valueOf(Integer.MAX_VALUE).floatValue();
System.out.println(value); // 2.14748365E9

final var value = Integer.valueOf(Integer.MIN_VALUE).floatValue();
System.out.println(value); // -2.14748365E9

static Integer getInteger (String nm)

Determines the integer value of the system property with the specified name.

final var key = "java.specification.version";

System.out.println(Integer.getInteger(key)); // 17
System.out.println(System.getProperty(key)); // "17"

final var key = "os.name";

System.out.println(Integer.getInteger(key)); // null
System.out.println(System.getProperty(key)); // "Windows 10"

static Integer getInteger (String nm, int val)

Determines the integer value of the system property with the specified name.

final var key = "java.specification.version";

System.out.println(Integer.getInteger(key, 999)); // 17
System.out.println(System.getProperty(key)); // "17"

final var key = "os.name";

System.out.println(Integer.getInteger(key)); // null
System.out.println(Integer.getInteger(key, 999)); // 999
System.out.println(System.getProperty(key)); // "Windows 10"

static Integer getInteger (String nm, Integer val)

Returns the integer value of the system property with the specified name.

final var key = "java.specification.version";

System.out.println(Integer.getInteger(key, Integer.valueOf(999))); // 17
System.out.println(System.getProperty(key)); // "17"

final var key = "os.name";

System.out.println(Integer.getInteger(key)); // null
System.out.println(Integer.getInteger(key, Integer.valueOf(999))); // 999
System.out.println(System.getProperty(key)); // "Windows 10"

int hashCode ()

Returns a hash code for this Integer.

System.out.println(Integer.valueOf(0).hashCode()); // 0
System.out.println(Integer.valueOf(1).hashCode()); // 1
System.out.println(Integer.valueOf(2).hashCode()); // 2
System.out.println(Integer.valueOf(3456).hashCode()); // 3456
System.out.println(Integer.valueOf(-7890).hashCode()); // -7890

System.out.println(Integer.valueOf(Integer.MAX_VALUE).hashCode()); // 2147483647
System.out.println(Integer.valueOf(Integer.MIN_VALUE).hashCode()); // -2147483648

static int hashCode (int value)

Returns a hash code for an int value; compatible with Integer.hashCode().

System.out.println(Integer.hashCode(0)); // 0
System.out.println(Integer.hashCode(1)); // 1
System.out.println(Integer.hashCode(2)); // 2
System.out.println(Integer.hashCode(3456)); // 3456
System.out.println(Integer.hashCode(-7890)); // -7890

System.out.println(Integer.hashCode(Integer.MAX_VALUE)); // 2147483647
System.out.println(Integer.hashCode(Integer.MIN_VALUE)); // -2147483648

static int highestOneBit (int i)

Returns an int value with at most a single one-bit, in the position of the highest-order ("leftmost") one-bit in the specified int value.

final var value = 0;
System.out.println(Integer.toBinaryString(value)); // "0"

final var ret = Integer.highestOneBit(value);
System.out.println(ret); // 0
System.out.println(Integer.toBinaryString(ret)); // "0"

final var value = 1;
System.out.println(Integer.toBinaryString(value)); // "1"

final var ret = Integer.highestOneBit(value);
System.out.println(ret); // 1
System.out.println(Integer.toBinaryString(ret)); // "1"

final var value = 2;
System.out.println(Integer.toBinaryString(value)); // "10"

final var ret = Integer.highestOneBit(value);
System.out.println(ret); // 2
System.out.println(Integer.toBinaryString(ret)); // "10"

final var value = 3;
System.out.println(Integer.toBinaryString(value)); // "11"

final var ret = Integer.highestOneBit(value);
System.out.println(ret); // 2
System.out.println(Integer.toBinaryString(ret)); // "10"

final var value = 4;
System.out.println(Integer.toBinaryString(value)); // "100"

final var ret = Integer.highestOneBit(value);
System.out.println(ret); // 4
System.out.println(Integer.toBinaryString(ret)); // "100"

final var value = 5;
System.out.println(Integer.toBinaryString(value)); // "101"

final var ret = Integer.highestOneBit(value);
System.out.println(ret); // 4
System.out.println(Integer.toBinaryString(ret)); // "100"

final var value = 6;
System.out.println(Integer.toBinaryString(value)); // "110"

final var ret = Integer.highestOneBit(value);
System.out.println(ret); // 4
System.out.println(Integer.toBinaryString(ret)); // "100"

final var value = 7;
System.out.println(Integer.toBinaryString(value)); // "111"

final var ret = Integer.highestOneBit(value);
System.out.println(ret); // 4
System.out.println(Integer.toBinaryString(ret)); // "100"

final var value = 8;
System.out.println(Integer.toBinaryString(value)); // "1000"

final var ret = Integer.highestOneBit(value);
System.out.println(ret); // 8
System.out.println(Integer.toBinaryString(ret)); // "1000"

final var value = Integer.MAX_VALUE;
System.out.println(Integer.toBinaryString(value)); // "1111111111111111111111111111111"

final var ret = Integer.highestOneBit(value);
System.out.println(ret); // 1073741824
System.out.println(Integer.toBinaryString(ret)); // "1000000000000000000000000000000"

final var value = Integer.MIN_VALUE;
System.out.println(Integer.toBinaryString(value)); // "10000000000000000000000000000000"

final var ret = Integer.highestOneBit(value);
System.out.println(ret); // -2147483648
System.out.println(Integer.toBinaryString(ret)); // "10000000000000000000000000000000"

int intValue ()

Returns the value of this Integer as an int.

final var value = Integer.valueOf(1234).intValue();
System.out.println(value); // 1234

final var value = Integer.valueOf(-4567).intValue();
System.out.println(value); // -4567

final var value = Integer.valueOf(Integer.MAX_VALUE).intValue();
System.out.println(value); // 2147483647

final var value = Integer.valueOf(Integer.MIN_VALUE).intValue();
System.out.println(value); // -2147483648

long longValue ()

Returns the value of this Integer as a long after a widening primitive conversion.

final var value = Integer.valueOf(1234).longValue();
System.out.println(value); // 1234

final var value = Integer.valueOf(-4567).longValue();
System.out.println(value); // -4567

final var value = Integer.valueOf(Integer.MAX_VALUE).longValue();
System.out.println(value); // 2147483647

final var value = Integer.valueOf(Integer.MIN_VALUE).longValue();
System.out.println(value); // -2147483648

static int lowestOneBit (int i)

Returns an int value with at most a single one-bit, in the position of the lowest-order ("rightmost") one-bit in the specified int value.

final var value = 0;
System.out.println(Integer.toBinaryString(value)); // "0"

final var result = Integer.lowestOneBit(value);
System.out.println(result); // 0
System.out.println(Integer.toBinaryString(result)); // "0"

final var value = 1;
System.out.println(Integer.toBinaryString(value)); // "1"

final var result = Integer.lowestOneBit(value);
System.out.println(result); // 1
System.out.println(Integer.toBinaryString(result)); // "1"

final var value = 2;
System.out.println(Integer.toBinaryString(value)); // "10"

final var result = Integer.lowestOneBit(value);
System.out.println(result); // 2
System.out.println(Integer.toBinaryString(result)); // "10"

final var value = 3;
System.out.println(Integer.toBinaryString(value)); // "11"

final var result = Integer.lowestOneBit(value);
System.out.println(result); // 1
System.out.println(Integer.toBinaryString(result)); // "1"

final var value = 4;
System.out.println(Integer.toBinaryString(value)); // "100"

final var result = Integer.lowestOneBit(value);
System.out.println(result); // 4
System.out.println(Integer.toBinaryString(result)); // "100"

final var value = 5;
System.out.println(Integer.toBinaryString(value)); // "101"

final var result = Integer.lowestOneBit(value);
System.out.println(result); // 1
System.out.println(Integer.toBinaryString(result)); // "1"

final var value = 6;
System.out.println(Integer.toBinaryString(value)); // "110"

final var result = Integer.lowestOneBit(value);
System.out.println(result); // 2
System.out.println(Integer.toBinaryString(result)); // "10"

final var value = 7;
System.out.println(Integer.toBinaryString(value)); // "111"

final var result = Integer.lowestOneBit(value);
System.out.println(result); // 1
System.out.println(Integer.toBinaryString(result)); // "1"

final var value = Integer.MAX_VALUE;
System.out.println(Integer.toBinaryString(value)); // "1111111111111111111111111111111"

final var result = Integer.lowestOneBit(value);
System.out.println(result); // 1
System.out.println(Integer.toBinaryString(result)); // "1"

final var value = Integer.MIN_VALUE;
System.out.println(Integer.toBinaryString(value)); // "10000000000000000000000000000000"

final var result = Integer.lowestOneBit(value);
System.out.println(result); // -2147483648
System.out.println(Integer.toBinaryString(result)); // "10000000000000000000000000000000"

static int max (int a, int b)

Returns the greater of two int values as if by calling Math.max.

System.out.println(Integer.max(1, 1)); // 1
System.out.println(Integer.max(1, 999)); // 999
System.out.println(Integer.max(888, 2)); // 888

System.out.println(Integer.max(1, -999)); // 1
System.out.println(Integer.max(-888, 2)); // 2
System.out.println(Integer.max(-1, -2)); // -1

static int min (int a, int b)

Returns the smaller of two int values as if by calling Math.min.

System.out.println(Integer.min(1, 1)); // 1
System.out.println(Integer.min(1, 999)); // 1
System.out.println(Integer.min(888, 2)); // 2

System.out.println(Integer.min(1, -999)); // -999
System.out.println(Integer.min(-888, 2)); // -888
System.out.println(Integer.min(-1, -2)); // -2

static int numberOfLeadingZeros (int i)

Returns the number of zero bits preceding the highest-order ("leftmost") one-bit in the two's complement binary representation of the specified int value.

final var value = 0;
System.out.println(Integer.toBinaryString(value)); // "0"
System.out.println(Integer.numberOfLeadingZeros(value)); // 32

final var value = 1;
System.out.println(Integer.toBinaryString(value)); // "1"
System.out.println(Integer.numberOfLeadingZeros(value)); // 31

final var value = 2;
System.out.println(Integer.toBinaryString(value)); // "10"
System.out.println(Integer.numberOfLeadingZeros(value)); // 30

final var value = 3;
System.out.println(Integer.toBinaryString(value)); // "11"
System.out.println(Integer.numberOfLeadingZeros(value)); // 30

final var value = 4;
System.out.println(Integer.toBinaryString(value)); // "100"
System.out.println(Integer.numberOfLeadingZeros(value)); // 29

final var value = 5;
System.out.println(Integer.toBinaryString(value)); // "101"
System.out.println(Integer.numberOfLeadingZeros(value)); // 29

final var value = 6;
System.out.println(Integer.toBinaryString(value)); // "110"
System.out.println(Integer.numberOfLeadingZeros(value)); // 29

final var value = 7;
System.out.println(Integer.toBinaryString(value)); // "111"
System.out.println(Integer.numberOfLeadingZeros(value)); // 29

final var value = 8;
System.out.println(Integer.toBinaryString(value)); // "1000"
System.out.println(Integer.numberOfLeadingZeros(value)); // 28

final var value = 16;
System.out.println(Integer.toBinaryString(value)); // "10000"
System.out.println(Integer.numberOfLeadingZeros(value)); // 27

final var value = 32;
System.out.println(Integer.toBinaryString(value)); // "100000"
System.out.println(Integer.numberOfLeadingZeros(value)); // 26

final var value = Integer.MAX_VALUE;
System.out.println(Integer.toBinaryString(value)); // "1111111111111111111111111111111"
System.out.println(Integer.numberOfLeadingZeros(value)); // 1

final var value = Integer.MIN_VALUE;
System.out.println(Integer.toBinaryString(value)); // "10000000000000000000000000000000"
System.out.println(Integer.numberOfLeadingZeros(value)); // 0

static int numberOfTrailingZeros (int i)

Returns the number of zero bits following the lowest-order ("rightmost") one-bit in the two's complement binary representation of the specified int value.

final var value = 0;
System.out.println(Integer.toBinaryString(value)); // "0"
System.out.println(Integer.numberOfTrailingZeros(value)); // 32

final var value = 1;
System.out.println(Integer.toBinaryString(value)); // "1"
System.out.println(Integer.numberOfTrailingZeros(value)); // 0

final var value = 2;
System.out.println(Integer.toBinaryString(value)); // "10"
System.out.println(Integer.numberOfTrailingZeros(value)); // 1

final var value = 3;
System.out.println(Integer.toBinaryString(value)); // "11"
System.out.println(Integer.numberOfTrailingZeros(value)); // 0

final var value = 4;
System.out.println(Integer.toBinaryString(value)); // "100"
System.out.println(Integer.numberOfTrailingZeros(value)); // 2

final var value = 5;
System.out.println(Integer.toBinaryString(value)); // "101"
System.out.println(Integer.numberOfTrailingZeros(value)); // 0

final var value = 6;
System.out.println(Integer.toBinaryString(value)); // "110"
System.out.println(Integer.numberOfTrailingZeros(value)); // 1

final var value = 7;
System.out.println(Integer.toBinaryString(value)); // "111"
System.out.println(Integer.numberOfTrailingZeros(value)); // 0

final var value = 8;
System.out.println(Integer.toBinaryString(value)); // "1000"
System.out.println(Integer.numberOfTrailingZeros(value)); // 3

final var value = 16;
System.out.println(Integer.toBinaryString(value)); // "10000"
System.out.println(Integer.numberOfTrailingZeros(value)); // 4

final var value = 32;
System.out.println(Integer.toBinaryString(value)); // "100000"
System.out.println(Integer.numberOfTrailingZeros(value)); // 5

final var value = Integer.MAX_VALUE;
System.out.println(Integer.toBinaryString(value)); // "1111111111111111111111111111111"
System.out.println(Integer.numberOfTrailingZeros(value)); // 0

final var value = Integer.MIN_VALUE;
System.out.println(Integer.toBinaryString(value)); // "10000000000000000000000000000000"
System.out.println(Integer.numberOfTrailingZeros(value)); // 31

static int parseInt (CharSequence s, int beginIndex, int endIndex, int radix)

Parses the CharSequence argument as a signed int in the specified radix, beginning at the specified beginIndex and extending to endIndex - 1.

Please see also : parseInt(String s, int radix)

final var s = "12345";

//Integer.parseInt(s, 0, 0, 10); // NumberFormatException
System.out.println(Integer.parseInt(s, 0, 1, 10)); // 1
System.out.println(Integer.parseInt(s, 0, 2, 10)); // 12
System.out.println(Integer.parseInt(s, 0, 3, 10)); // 123
System.out.println(Integer.parseInt(s, 0, 4, 10)); // 1234
System.out.println(Integer.parseInt(s, 0, 5, 10)); // 12345
//Integer.parseInt(s, 0, 6, 10); // IndexOutOfBoundsException

System.out.println(Integer.parseInt(s, 1, 5, 10)); // 2345
System.out.println(Integer.parseInt(s, 2, 5, 10)); // 345
System.out.println(Integer.parseInt(s, 3, 5, 10)); // 45
System.out.println(Integer.parseInt(s, 4, 5, 10)); // 5

static int parseInt (String s)

Parses the string argument as a signed decimal integer.

System.out.println(Integer.parseInt("0")); // 0
System.out.println(Integer.parseInt("123")); // 123
System.out.println(Integer.parseInt("+456")); // 456
System.out.println(Integer.parseInt("-789")); // -789

System.out.println(Integer.parseInt("2147483647")); // 2147483647
//Integer.parseInt("2147483648"); // NumberFormatException

System.out.println(Integer.parseInt("-2147483648")); // -2147483648
//Integer.parseInt("-2147483649"); // NumberFormatException

static int parseInt (String s, int radix)

Parses the string argument as a signed integer in the radix specified by the second argument.

System.out.println(Integer.parseInt("0", 10)); // 0
System.out.println(Integer.parseInt("473", 10)); // 473
System.out.println(Integer.parseInt("+42", 10)); // 42
System.out.println(Integer.parseInt("-0", 10)); // 0
System.out.println(Integer.parseInt("-FF", 16)); // -255
System.out.println(Integer.parseInt("1100110", 2)); // 102
System.out.println(Integer.parseInt("2147483647", 10)); // 2147483647
System.out.println(Integer.parseInt("-2147483648", 10)); // -2147483648

//Integer.parseInt("2147483648", 10); // NumberFormatException
//Integer.parseInt("99", 8); // NumberFormatException
//Integer.parseInt("Kona", 10); // NumberFormatException

System.out.println(Integer.parseInt("Kona", 27)); // 411787

static int parseUnsignedInt (CharSequence s, int beginIndex, int endIndex, int radix)

Parses the CharSequence argument as an unsigned int in the specified radix, beginning at the specified beginIndex and extending to endIndex - 1.

Please see also : parseUnsignedInt(String s, int radix)

final var s = "12345";

//Integer.parseUnsignedInt(s, 0, 0, 10); // NumberFormatException
System.out.println(Integer.parseUnsignedInt(s, 0, 1, 10)); // 1
System.out.println(Integer.parseUnsignedInt(s, 0, 2, 10)); // 12
System.out.println(Integer.parseUnsignedInt(s, 0, 3, 10)); // 123
System.out.println(Integer.parseUnsignedInt(s, 0, 4, 10)); // 1234
System.out.println(Integer.parseUnsignedInt(s, 0, 5, 10)); // 12345
//Integer.parseUnsignedInt(s, 0, 6, 10); // IndexOutOfBoundsException

System.out.println(Integer.parseUnsignedInt(s, 1, 5, 10)); // 2345
System.out.println(Integer.parseUnsignedInt(s, 2, 5, 10)); // 345
System.out.println(Integer.parseUnsignedInt(s, 3, 5, 10)); // 45
System.out.println(Integer.parseUnsignedInt(s, 4, 5, 10)); // 5

static int parseUnsignedInt (String s)

Parses the string argument as an unsigned decimal integer.

System.out.println(Integer.parseUnsignedInt("0")); //  0
System.out.println(Integer.parseUnsignedInt("123")); // 123
//Integer.parseUnsignedInt("-456"); // NumberFormatException

System.out.println(Integer.MAX_VALUE); // 2147483647

System.out.println(Integer.parseUnsignedInt("2147483647")); // 2147483647
System.out.println(Integer.parseUnsignedInt("2147483648")); // -2147483648
System.out.println(Integer.parseUnsignedInt("2147483649")); // -2147483647

static int parseUnsignedInt (String s, int radix)

Parses the string argument as an unsigned integer in the radix specified by the second argument.

System.out.println(Integer.parseUnsignedInt("0", 10)); //  0
System.out.println(Integer.parseUnsignedInt("123", 10)); // 123
//Integer.parseUnsignedInt("-456", 10); // NumberFormatException

System.out.println(Integer.MAX_VALUE); // 2147483647

System.out.println(Integer.parseUnsignedInt("2147483647", 10)); // 2147483647
System.out.println(Integer.parseUnsignedInt("2147483648", 10)); // -2147483648
System.out.println(Integer.parseUnsignedInt("2147483649", 10)); // -2147483647

System.out.println(Integer.parseUnsignedInt("FF", 16)); // 255
//Integer.parseUnsignedInt("-AA", 16); // NumberFormatException

System.out.println(Integer.parseUnsignedInt("1100110", 2)); // 102
//Integer.parseUnsignedInt("-1010"); // NumberFormatException

static int remainderUnsigned (int dividend, int divisor)

Returns the unsigned remainder from dividing the first argument by the second where each argument and the result is interpreted as an unsigned value.

final var value = -1294967292;
System.out.println(Integer.toUnsignedString(value)); // 3000000004

System.out.println(Integer.remainderUnsigned(value, 10)); // 4
System.out.println(value % 10); // -2

Integer resolveConstantDesc (MethodHandles.Lookup lookup)

Resolves this instance as a ConstantDesc, the result of which is the instance itself.

final var integer = Integer.valueOf(123);

final var ret = integer.resolveConstantDesc(MethodHandles.lookup());
System.out.println(ret); // 123

static int reverse (int i)

Returns the value obtained by reversing the order of the bits in the two's complement binary representation of the specified int value.

final var value = 0;
System.out.println(value); // 0

final var ret = Integer.reverse(value);
System.out.println(ret); // 0

System.out.println("-- print --");
System.out.println("%32s".formatted(Integer.toBinaryString(value)).replace(" ", "0"));
System.out.println("%32s".formatted(Integer.toBinaryString(ret)).replace(" ", "0"));

// Result
// ↓
//-- print --
//00000000000000000000000000000000
//00000000000000000000000000000000

final var value = 1;
System.out.println(value); // 1

final var ret = Integer.reverse(value);
System.out.println(ret); // -2147483648

System.out.println("-- print --");
System.out.println("%32s".formatted(Integer.toBinaryString(value)).replace(" ", "0"));
System.out.println("%32s".formatted(Integer.toBinaryString(ret)).replace(" ", "0"));

// Result
// ↓
//-- print --
//00000000000000000000000000000001
//10000000000000000000000000000000

final var value = 2;
System.out.println(value); // 2

final var ret = Integer.reverse(value);
System.out.println(ret); // 1073741824

System.out.println("-- print --");
System.out.println("%32s".formatted(Integer.toBinaryString(value)).replace(" ", "0"));
System.out.println("%32s".formatted(Integer.toBinaryString(ret)).replace(" ", "0"));

// Result
// ↓
//-- print --
//00000000000000000000000000000010
//01000000000000000000000000000000

final var value = 0x0f0f;
System.out.println(value); // 3855

final var ret = Integer.reverse(value);
System.out.println(ret); // -252706816

System.out.println("-- print --");
System.out.println("%32s".formatted(Integer.toBinaryString(value)).replace(" ", "0"));
System.out.println("%32s".formatted(Integer.toBinaryString(ret)).replace(" ", "0"));

// Result
// ↓
//-- print --
//00000000000000000000111100001111
//11110000111100000000000000000000

final var value = Integer.MAX_VALUE;
System.out.println(value); // 2147483647

final var ret = Integer.reverse(value);
System.out.println(ret); // -2

System.out.println("-- print --");
System.out.println("%32s".formatted(Integer.toBinaryString(value)).replace(" ", "0"));
System.out.println("%32s".formatted(Integer.toBinaryString(ret)).replace(" ", "0"));

// Result
// ↓
//-- print --
//01111111111111111111111111111111
//11111111111111111111111111111110

final var value = Integer.MIN_VALUE;
System.out.println(value); // -2147483648

final var ret = Integer.reverse(value);
System.out.println(ret); // 1

System.out.println("-- print --");
System.out.println("%32s".formatted(Integer.toBinaryString(value)).replace(" ", "0"));
System.out.println("%32s".formatted(Integer.toBinaryString(ret)).replace(" ", "0"));

// Result
// ↓
//-- print --
//10000000000000000000000000000000
//00000000000000000000000000000001

static int reverseBytes (int i)

Returns the value obtained by reversing the order of the bytes in the two's complement representation of the specified int value.

final var value = 0x0;
final var ret = Integer.reverseBytes(value);

System.out.println("-- print --");
System.out.println("%8s".formatted(Integer.toHexString(value)).replace(" ", "0"));
System.out.println("%8s".formatted(Integer.toHexString(ret)).replace(" ", "0"));

// Result
// ↓
//-- print --
//00000000
//00000000

final var value = 0x1;
final var ret = Integer.reverseBytes(value);

System.out.println("-- print --");
System.out.println("%8s".formatted(Integer.toHexString(value)).replace(" ", "0"));
System.out.println("%8s".formatted(Integer.toHexString(ret)).replace(" ", "0"));

// Result
// ↓
//-- print --
//00000001
//01000000

final var value = 0xf;
final var ret = Integer.reverseBytes(value);

System.out.println("-- print --");
System.out.println("%8s".formatted(Integer.toHexString(value)).replace(" ", "0"));
System.out.println("%8s".formatted(Integer.toHexString(ret)).replace(" ", "0"));

// Result
// ↓
//-- print --
//0000000f
//0f000000

final var value = 0x10;
final var ret = Integer.reverseBytes(value);

System.out.println("-- print --");
System.out.println("%8s".formatted(Integer.toHexString(value)).replace(" ", "0"));
System.out.println("%8s".formatted(Integer.toHexString(ret)).replace(" ", "0"));

// Result
// ↓
//-- print --
//00000010
//10000000

final var value = 0x1f;
final var ret = Integer.reverseBytes(value);

System.out.println("-- print --");
System.out.println("%8s".formatted(Integer.toHexString(value)).replace(" ", "0"));
System.out.println("%8s".formatted(Integer.toHexString(ret)).replace(" ", "0"));

// Result
// ↓
//-- print --
//0000001f
//1f000000

final var value = 0x1234567;
final var ret = Integer.reverseBytes(value);

System.out.println("-- print --");
System.out.println("%8s".formatted(Integer.toHexString(value)).replace(" ", "0"));
System.out.println("%8s".formatted(Integer.toHexString(ret)).replace(" ", "0"));

// Result
// ↓
//-- print --
//01234567
//67452301

final var value = Integer.MAX_VALUE;
final var ret = Integer.reverseBytes(value);

System.out.println("-- print --");
System.out.println("%8s".formatted(Integer.toHexString(value)).replace(" ", "0"));
System.out.println("%8s".formatted(Integer.toHexString(ret)).replace(" ", "0"));

// Result
// ↓
//-- print --
//7fffffff
//ffffff7f

final var value = Integer.MIN_VALUE;
final var ret = Integer.reverseBytes(value);

System.out.println("-- print --");
System.out.println("%8s".formatted(Integer.toHexString(value)).replace(" ", "0"));
System.out.println("%8s".formatted(Integer.toHexString(ret)).replace(" ", "0"));

// Result
// ↓
//-- print --
//80000000
//00000080

static int rotateLeft (int i, int distance)

Returns the value obtained by rotating the two's complement binary representation of the specified int value left by the specified number of bits.

final int value = 1;
for (int i = 0; i < 33; i++) {
    final var ret = Integer.rotateLeft(value, i);
    System.out.printf("i = %2d : %s%n", i, Integer.toBinaryString(ret));
}

// Result
// ↓
//i =  0 : 1
//i =  1 : 10
//i =  2 : 100
//i =  3 : 1000
//i =  4 : 10000
//i =  5 : 100000
//i =  6 : 1000000
//i =  7 : 10000000
//i =  8 : 100000000
//i =  9 : 1000000000
//i = 10 : 10000000000
//i = 11 : 100000000000
//i = 12 : 1000000000000
//i = 13 : 10000000000000
//i = 14 : 100000000000000
//i = 15 : 1000000000000000
//i = 16 : 10000000000000000
//i = 17 : 100000000000000000
//i = 18 : 1000000000000000000
//i = 19 : 10000000000000000000
//i = 20 : 100000000000000000000
//i = 21 : 1000000000000000000000
//i = 22 : 10000000000000000000000
//i = 23 : 100000000000000000000000
//i = 24 : 1000000000000000000000000
//i = 25 : 10000000000000000000000000
//i = 26 : 100000000000000000000000000
//i = 27 : 1000000000000000000000000000
//i = 28 : 10000000000000000000000000000
//i = 29 : 100000000000000000000000000000
//i = 30 : 1000000000000000000000000000000
//i = 31 : 10000000000000000000000000000000
//i = 32 : 1

final int value = Integer.MAX_VALUE;
for (int i = 0; i < 33; i++) {
    final var ret = Integer.rotateLeft(value, i);
    System.out.printf("i = %2d : %32s%n", i, Integer.toBinaryString(ret));
}

// Result
// ↓
//i =  0 :  1111111111111111111111111111111
//i =  1 : 11111111111111111111111111111110
//i =  2 : 11111111111111111111111111111101
//i =  3 : 11111111111111111111111111111011
//i =  4 : 11111111111111111111111111110111
//i =  5 : 11111111111111111111111111101111
//i =  6 : 11111111111111111111111111011111
//i =  7 : 11111111111111111111111110111111
//i =  8 : 11111111111111111111111101111111
//i =  9 : 11111111111111111111111011111111
//i = 10 : 11111111111111111111110111111111
//i = 11 : 11111111111111111111101111111111
//i = 12 : 11111111111111111111011111111111
//i = 13 : 11111111111111111110111111111111
//i = 14 : 11111111111111111101111111111111
//i = 15 : 11111111111111111011111111111111
//i = 16 : 11111111111111110111111111111111
//i = 17 : 11111111111111101111111111111111
//i = 18 : 11111111111111011111111111111111
//i = 19 : 11111111111110111111111111111111
//i = 20 : 11111111111101111111111111111111
//i = 21 : 11111111111011111111111111111111
//i = 22 : 11111111110111111111111111111111
//i = 23 : 11111111101111111111111111111111
//i = 24 : 11111111011111111111111111111111
//i = 25 : 11111110111111111111111111111111
//i = 26 : 11111101111111111111111111111111
//i = 27 : 11111011111111111111111111111111
//i = 28 : 11110111111111111111111111111111
//i = 29 : 11101111111111111111111111111111
//i = 30 : 11011111111111111111111111111111
//i = 31 : 10111111111111111111111111111111
//i = 32 :  1111111111111111111111111111111

static int rotateRight (int i, int distance)

Returns the value obtained by rotating the two's complement binary representation of the specified int value right by the specified number of bits.

final int value = 1;
for (int i = 0; i < 33; i++) {
    final var ret = Integer.rotateRight(value, i);
    System.out.printf("i = %2d : %s%n", i, Integer.toBinaryString(ret));
}

// Result
// ↓
//i =  0 : 1
//i =  1 : 10000000000000000000000000000000
//i =  2 : 1000000000000000000000000000000
//i =  3 : 100000000000000000000000000000
//i =  4 : 10000000000000000000000000000
//i =  5 : 1000000000000000000000000000
//i =  6 : 100000000000000000000000000
//i =  7 : 10000000000000000000000000
//i =  8 : 1000000000000000000000000
//i =  9 : 100000000000000000000000
//i = 10 : 10000000000000000000000
//i = 11 : 1000000000000000000000
//i = 12 : 100000000000000000000
//i = 13 : 10000000000000000000
//i = 14 : 1000000000000000000
//i = 15 : 100000000000000000
//i = 16 : 10000000000000000
//i = 17 : 1000000000000000
//i = 18 : 100000000000000
//i = 19 : 10000000000000
//i = 20 : 1000000000000
//i = 21 : 100000000000
//i = 22 : 10000000000
//i = 23 : 1000000000
//i = 24 : 100000000
//i = 25 : 10000000
//i = 26 : 1000000
//i = 27 : 100000
//i = 28 : 10000
//i = 29 : 1000
//i = 30 : 100
//i = 31 : 10
//i = 32 : 1

final int value = Integer.MAX_VALUE;
for (int i = 0; i < 33; i++) {
    final var ret = Integer.rotateRight(value, i);
    System.out.printf("i = %2d : %32s%n", i, Integer.toBinaryString(ret));
}

// Result
// ↓
//i =  0 :  1111111111111111111111111111111
//i =  1 : 10111111111111111111111111111111
//i =  2 : 11011111111111111111111111111111
//i =  3 : 11101111111111111111111111111111
//i =  4 : 11110111111111111111111111111111
//i =  5 : 11111011111111111111111111111111
//i =  6 : 11111101111111111111111111111111
//i =  7 : 11111110111111111111111111111111
//i =  8 : 11111111011111111111111111111111
//i =  9 : 11111111101111111111111111111111
//i = 10 : 11111111110111111111111111111111
//i = 11 : 11111111111011111111111111111111
//i = 12 : 11111111111101111111111111111111
//i = 13 : 11111111111110111111111111111111
//i = 14 : 11111111111111011111111111111111
//i = 15 : 11111111111111101111111111111111
//i = 16 : 11111111111111110111111111111111
//i = 17 : 11111111111111111011111111111111
//i = 18 : 11111111111111111101111111111111
//i = 19 : 11111111111111111110111111111111
//i = 20 : 11111111111111111111011111111111
//i = 21 : 11111111111111111111101111111111
//i = 22 : 11111111111111111111110111111111
//i = 23 : 11111111111111111111111011111111
//i = 24 : 11111111111111111111111101111111
//i = 25 : 11111111111111111111111110111111
//i = 26 : 11111111111111111111111111011111
//i = 27 : 11111111111111111111111111101111
//i = 28 : 11111111111111111111111111110111
//i = 29 : 11111111111111111111111111111011
//i = 30 : 11111111111111111111111111111101
//i = 31 : 11111111111111111111111111111110
//i = 32 :  1111111111111111111111111111111

short shortValue ()

Returns the value of this Integer as a short after a narrowing primitive conversion.

final var ret1 = Integer.valueOf(0).shortValue();
System.out.println(ret1); // 0

final var ret2 = Integer.valueOf(123).shortValue();
System.out.println(ret2); // 123

final var ret3 = Integer.valueOf(-456).shortValue();
System.out.println(ret3); // -456

final var ret1 = Integer.valueOf(Short.MAX_VALUE).shortValue();
System.out.println(ret1); // 32767

final var ret2 = Integer.valueOf(Short.MIN_VALUE).shortValue();
System.out.println(ret2); // -32768

final var ret1 = Integer.valueOf(32767).shortValue();
System.out.println(ret1); // 32767

final var ret3 = Integer.valueOf(32768).shortValue();
System.out.println(ret3); // -32768

final var ret4 = Integer.valueOf(32769).shortValue();
System.out.println(ret4); // -32767

final var ret1 = Integer.valueOf(-32768).shortValue();
System.out.println(ret1); // -32768

final var ret3 = Integer.valueOf(-32769).shortValue();
System.out.println(ret3); // 32767

final var ret4 = Integer.valueOf(-32770).shortValue();
System.out.println(ret4); // 32766

static int signum (int i)

Returns the signum function of the specified int value.

System.out.println(Integer.signum(100)); // 1
System.out.println(Integer.signum(-100)); // -1

System.out.println(Integer.signum(0)); // 0
System.out.println(Integer.signum(-0)); // 0

System.out.println(Integer.signum(Integer.MAX_VALUE)); // 1
System.out.println(Integer.signum(Integer.MIN_VALUE)); // -1

static int sum (int a, int b)

Adds two integers together as per the + operator.

System.out.println(Integer.sum(100, 200)); // 300
System.out.println(Integer.sum(-300, 200)); // -100

System.out.println(Integer.sum(Integer.MAX_VALUE, Integer.MIN_VALUE)); // -1
System.out.println(Integer.sum(Integer.MAX_VALUE, 1)); // -2147483648
System.out.println(Integer.sum(Integer.MIN_VALUE, -1)); // 2147483647

static String toBinaryString (int i)

Returns a string representation of the integer argument as an unsigned integer in base 2.

System.out.println(Integer.toBinaryString(0)); // "0"
System.out.println(Integer.toBinaryString(1)); // "1"
System.out.println(Integer.toBinaryString(2)); // "10"
System.out.println(Integer.toBinaryString(3)); // "11"
System.out.println(Integer.toBinaryString(4)); // "100"
System.out.println(Integer.toBinaryString(5)); // "101"
System.out.println(Integer.toBinaryString(6)); // "110"
System.out.println(Integer.toBinaryString(7)); // "111"
System.out.println(Integer.toBinaryString(8)); // "1000"

System.out.println(Integer.toBinaryString(-1)); // "11111111111111111111111111111111"
System.out.println(Integer.toBinaryString(-2)); // "11111111111111111111111111111110"
System.out.println(Integer.toBinaryString(-3)); // "11111111111111111111111111111101"

System.out.println(Integer.toBinaryString(Integer.MAX_VALUE)); // "1111111111111111111111111111111"
System.out.println(Integer.toBinaryString(Integer.MIN_VALUE)); // "10000000000000000000000000000000"

static String toHexString (int i)

Returns a string representation of the integer argument as an unsigned integer in base 16.

System.out.println(Integer.toHexString(0)); // "0"
System.out.println(Integer.toHexString(1)); // "1"
System.out.println(Integer.toHexString(2)); // "2"
System.out.println(Integer.toHexString(3)); // "3"
System.out.println(Integer.toHexString(4)); // "4"
System.out.println(Integer.toHexString(5)); // "5"
System.out.println(Integer.toHexString(6)); // "6"
System.out.println(Integer.toHexString(7)); // "7"
System.out.println(Integer.toHexString(8)); // "8"
System.out.println(Integer.toHexString(9)); // "9"
System.out.println(Integer.toHexString(10)); // "a"
System.out.println(Integer.toHexString(11)); // "b"
System.out.println(Integer.toHexString(12)); // "c"
System.out.println(Integer.toHexString(13)); // "d"
System.out.println(Integer.toHexString(14)); // "e"
System.out.println(Integer.toHexString(15)); // "f"
System.out.println(Integer.toHexString(16)); // "10"
System.out.println(Integer.toHexString(17)); // "11"

System.out.println(Integer.toHexString(-1)); // "ffffffff"
System.out.println(Integer.toHexString(-2)); // "fffffffe"
System.out.println(Integer.toHexString(-3)); // "fffffffd"

System.out.println(Integer.toHexString(Integer.MAX_VALUE)); // "7fffffff"
System.out.println(Integer.toHexString(Integer.MIN_VALUE)); // "80000000"

static String toOctalString (int i)

Returns a string representation of the integer argument as an unsigned integer in base 8.

System.out.println(Integer.toOctalString(0)); // "0"
System.out.println(Integer.toOctalString(1)); // "1"
System.out.println(Integer.toOctalString(2)); // "2"
System.out.println(Integer.toOctalString(3)); // "3"
System.out.println(Integer.toOctalString(4)); // "4"
System.out.println(Integer.toOctalString(5)); // "5"
System.out.println(Integer.toOctalString(6)); // "6"
System.out.println(Integer.toOctalString(7)); // "7"
System.out.println(Integer.toOctalString(8)); // "10"
System.out.println(Integer.toOctalString(9)); // "11"
System.out.println(Integer.toOctalString(10)); // "12"
System.out.println(Integer.toOctalString(11)); // "13"

System.out.println(Integer.toOctalString(-1)); // "37777777777"
System.out.println(Integer.toOctalString(-2)); // "37777777776"
System.out.println(Integer.toOctalString(-3)); // "37777777775"

System.out.println(Integer.toOctalString(Integer.MAX_VALUE)); // "17777777777"
System.out.println(Integer.toOctalString(Integer.MIN_VALUE)); // "20000000000"

String toString ()

Returns a String object representing this Integer's value.

final var ret1 = Integer.valueOf(123).toString();
System.out.println(ret1); // "123"

final var ret2 = Integer.valueOf(-456).toString();
System.out.println(ret2); // "-456"

static String toString (int i)

Returns a String object representing the specified integer.

final var ret1 = Integer.toString(123);
System.out.println(ret1); // "123"

final var ret2 = Integer.toString(-456);
System.out.println(ret2); // "-456"

System.out.println(Integer.toString(Integer.MAX_VALUE)); // "2147483647"
System.out.println(Integer.toString(Integer.MIN_VALUE)); // "-2147483648"

static String toString (int i, int radix)

Returns a string representation of the first argument in the radix specified by the second argument.

final var ret1 = Integer.toString(123, 10);
System.out.println(ret1); // "123"

final var ret2 = Integer.toString(-456, 10);
System.out.println(ret2); // "-456"

System.out.println(Integer.toString(Integer.MAX_VALUE, 10)); // "2147483647"
System.out.println(Integer.toString(Integer.MIN_VALUE, 10)); // "-2147483648"

// Hexadecimal
final var ret1 = Integer.toString(255, 16); // "ff"
System.out.println(ret1);

final var ret2 = Integer.toString(-128, 16); // "-80"
System.out.println(ret2);

System.out.println(Integer.toString(Integer.MAX_VALUE, 16)); // "7fffffff"
System.out.println(Integer.toString(Integer.MIN_VALUE, 16)); // "-80000000"

static long toUnsignedLong (int x)

Converts the argument to a long by an unsigned conversion.

System.out.println(Integer.toUnsignedLong(0)); // 0
System.out.println(Integer.toUnsignedLong(123)); // 123

System.out.println(Integer.toUnsignedLong(Integer.MAX_VALUE)); // 2147483647
System.out.println(Integer.toUnsignedLong(Integer.MIN_VALUE)); // 2147483648

System.out.println(Integer.toUnsignedLong(-1)); // 4294967295
System.out.println(Integer.toUnsignedLong(-2)); // 4294967294
System.out.println(Integer.toUnsignedLong(-3)); // 4294967293

static String toUnsignedString (int i)

Returns a string representation of the argument as an unsigned decimal value.

System.out.println(Integer.toUnsignedString(0)); // "0"
System.out.println(Integer.toUnsignedString(123)); // "123"

System.out.println(Integer.toUnsignedString(Integer.MAX_VALUE)); // "2147483647"
System.out.println(Integer.toUnsignedString(Integer.MIN_VALUE)); // "2147483648"

System.out.println(Integer.toUnsignedString(-1)); // "4294967295"
System.out.println(Integer.toUnsignedString(-2)); // "4294967294"
System.out.println(Integer.toUnsignedString(-3)); // "4294967293"

static String toUnsignedString (int i, int radix)

Returns a string representation of the first argument as an unsigned integer value in the radix specified by the second argument.

System.out.println(Integer.toUnsignedString(0, 10)); // "0"
System.out.println(Integer.toUnsignedString(123, 10)); // "123"

System.out.println(Integer.toUnsignedString(Integer.MAX_VALUE, 10)); // "2147483647"
System.out.println(Integer.toUnsignedString(Integer.MIN_VALUE, 10)); // "2147483648"

System.out.println(Integer.toUnsignedString(-1, 10)); // "4294967295"
System.out.println(Integer.toUnsignedString(-2, 10)); // "4294967294"
System.out.println(Integer.toUnsignedString(-3, 10)); // "4294967293"

// Character.MAX_RADIX = 36
for (int i = 0; i < Character.MAX_RADIX + 1; i++) {
    //i =  0 : 0
    //i =  1 : 1
    //i =  2 : 2
    //i =  3 : 3
    //i =  4 : 4
    //i =  5 : 5
    //i =  6 : 6
    //i =  7 : 7
    //i =  8 : 8
    //i =  9 : 9
    //i = 10 : a
    //i = 11 : b
    //i = 12 : c
    //i = 13 : d
    //i = 14 : e
    //i = 15 : f
    //i = 16 : g
    //i = 17 : h
    //i = 18 : i
    //i = 19 : j
    //i = 20 : k
    //i = 21 : l
    //i = 22 : m
    //i = 23 : n
    //i = 24 : o
    //i = 25 : p
    //i = 26 : q
    //i = 27 : r
    //i = 28 : s
    //i = 29 : t
    //i = 30 : u
    //i = 31 : v
    //i = 32 : w
    //i = 33 : x
    //i = 34 : y
    //i = 35 : z
    //i = 36 : 10
    System.out.printf("i = %2d : %s%n", i, Integer.toUnsignedString(i, Character.MAX_RADIX));
}

System.out.println(Integer.toUnsignedString(0, Character.MAX_RADIX)); // "0"
System.out.println(Integer.toUnsignedString(1234, Character.MAX_RADIX)); // "ya"

System.out.println(Integer.toUnsignedString(-1, Character.MAX_RADIX)); // "1z141z3"
System.out.println(Integer.toUnsignedString(-2, Character.MAX_RADIX)); // "1z141z2"
System.out.println(Integer.toUnsignedString(-3, Character.MAX_RADIX)); // "1z141z1"

System.out.println(Integer.toUnsignedString(Integer.MAX_VALUE, Character.MAX_RADIX)); // "zik0zj"
System.out.println(Integer.toUnsignedString(Integer.MIN_VALUE, Character.MAX_RADIX)); // "zik0zk"

static Integer valueOf (int i)

Returns an Integer instance representing the specified int value.

System.out.println(Integer.valueOf(0)); // 0
System.out.println(Integer.valueOf(1)); // 1
System.out.println(Integer.valueOf(2)); // 2
System.out.println(Integer.valueOf(100)); // 100
System.out.println(Integer.valueOf(9999)); // 9999

System.out.println(Integer.valueOf(-1)); // -1
System.out.println(Integer.valueOf(-2)); // -2
System.out.println(Integer.valueOf(-3)); // -3

System.out.println(Integer.valueOf(Integer.MAX_VALUE)); // 2147483647
System.out.println(Integer.valueOf(Integer.MIN_VALUE)); // -2147483648

static Integer valueOf (String s)

Returns an Integer object holding the value of the specified String.

System.out.println(Integer.valueOf("0")); // 0
System.out.println(Integer.valueOf("123")); // 123
System.out.println(Integer.valueOf("+456")); // 456
System.out.println(Integer.valueOf("-789")); // -789

System.out.println(Integer.valueOf("2147483647")); // 2147483647
//Integer.valueOf("2147483648"); // NumberFormatException

System.out.println(Integer.valueOf("-2147483648")); // -2147483648
//Integer.valueOf("-2147483649"); // NumberFormatException

static Integer valueOf (String s, int radix)

Returns an Integer object holding the value extracted from the specified String when parsed with the radix given by the second argument.

System.out.println(Integer.valueOf("0", 10)); // 0
System.out.println(Integer.valueOf("473", 10)); // 473
System.out.println(Integer.valueOf("+42", 10)); // 42
System.out.println(Integer.valueOf("-0", 10)); // 0
System.out.println(Integer.valueOf("-FF", 16)); // -255
System.out.println(Integer.valueOf("1100110", 2)); // 102
System.out.println(Integer.valueOf("2147483647", 10)); // 2147483647
System.out.println(Integer.valueOf("-2147483648", 10)); // -2147483648

//Integer.valueOf("2147483648", 10); // NumberFormatException
//Integer.valueOf("99", 8); // NumberFormatException
//Integer.valueOf("Kona", 10); // NumberFormatException

System.out.println(Integer.valueOf("Kona", 27)); // 411787

API Examples
- Number
  - BigDecimal
  - BigInteger
  - Byte
  - Double
  - Float
  - Long
  - Short
- NumberFormat
- Math
- MathContext
- RoundingMode
- StrictMath

Java : Integer with Examples

Summary

Fields

static final int BYTES

static final int MAX_VALUE

static final int MIN_VALUE

static final int SIZE

static final Class<Integer> TYPE

Constructors

Integer (int value)

Integer (String s)

Methods

static int bitCount (int i)

byte byteValue ()

static int compare (int x, int y)

int compareTo (Integer anotherInteger)

static int compareUnsigned (int x, int y)

static Integer decode (String nm)

Optional<Integer> describeConstable ()

static int divideUnsigned (int dividend, int divisor)

double doubleValue ()

boolean equals (Object obj)

float floatValue ()

static Integer getInteger (String nm)

static Integer getInteger (String nm, int val)

static Integer getInteger (String nm, Integer val)

int hashCode ()

static int hashCode (int value)

static int highestOneBit (int i)

int intValue ()

long longValue ()

static int lowestOneBit (int i)

static int max (int a, int b)

static int min (int a, int b)

static int numberOfLeadingZeros (int i)

static int numberOfTrailingZeros (int i)

static int parseInt (CharSequence s, int beginIndex, int endIndex, int radix)

static int parseInt (String s)

static int parseInt (String s, int radix)

static int parseUnsignedInt (CharSequence s, int beginIndex, int endIndex, int radix)

static int parseUnsignedInt (String s)

static int parseUnsignedInt (String s, int radix)

static int remainderUnsigned (int dividend, int divisor)

Integer resolveConstantDesc (MethodHandles.Lookup lookup)

static int reverse (int i)

static int reverseBytes (int i)

static int rotateLeft (int i, int distance)

static int rotateRight (int i, int distance)

short shortValue ()

static int signum (int i)

static int sum (int a, int b)

static String toBinaryString (int i)

static String toHexString (int i)

static String toOctalString (int i)

String toString ()

static String toString (int i)

static String toString (int i, int radix)

static long toUnsignedLong (int x)

static String toUnsignedString (int i)

static String toUnsignedString (int i, int radix)

static Integer valueOf (int i)

static Integer valueOf (String s)

static Integer valueOf (String s, int radix)

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